Definition of: grunt

(grunt) v.i.
1. To make the deep, guttural sound of a hog.
2. To make a similar sound, as in annoyance, assent, effort, etc.
—v.t.
3. To express, as dissent or disapproval, by grunting. See synonyms under COMPLAIN.
—noun
1. A short, guttural sound, as of a hog.
2. A food fish of warm American seas related to the snappers (Haemulon and related genera): so called from the noise it makes when caught. [OE grunnettan]
—grunt′er noun